The single side bottom pouring with internal gate is adopted. The flow and temperature distribution of ZL105 metal liquid filling in different stages are shown in Figure 1. It can be seen from the figure that the single side low injection type can realize the successful filling of liquid metal. When t = 2.0S, the molten metal begins to fill the sand casting; When t = 5S, the mold filling is completed by 15%; When t = 8s, the filling is completed by 40%; When t = 11S, the filling is completed by 70%; When t = 16S, the filling of sand casting is completed. Judging from the filling rate, the filling time distribution of sand castings is reasonable. Sand flushing and air entrainment are avoided in the previous stage, and the filling rate is slightly gentle; In the middle stage, the mold filling of sand castings is stable, the liquid level can rise at a uniform speed, and the mold filling rate of sand castings can be appropriately accelerated to improve the production efficiency; Finally, when the sand casting is completed to 80% ~ 90%, the filling rate of sand casting slows down due to the existence of gravity and liquid metal pouring pressure. However, in the end, it can be seen that there is no need to increase the height of horizontal static pressure when the filling of riser is completed successfully.
Fig. 2 shows the time distribution of filling each part of the mold cavity with liquid metal in the third scheme. It can be seen that the filling time of the bottom layer is different due to the use of one-sided gating system except before 10% of the initial stage. The first filling time of the liquid metal on the side close to the opening position of the inner gate is short, and the filling time of the liquid metal on the opposite side of the sand casting mold is long. However, due to the slow pouring at the bottom, when the liquid metal reaches 15%, the filling time at the same level is basically the same, and the filling of sand castings is very stable, which can effectively avoid inclusion, turbulence and metal oxidation pouring defects, and the filling time is more reasonable than the first two schemes.
